Annual report pursuant to Section 13 and 15(d)

Financial Assets And Financial Liabilities Carried At Fair Value On A Recurring Basis (Detail)

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Financial Assets And Financial Liabilities Carried At Fair Value On A Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Available-for-sale securities: $ 233,877 $ 293,809
Derivative assets 490  
Fair Value Measurements Recurring [Member]
   
Total assets   294,435
Fair Value Measurements Recurring [Member] | Us Treasury and Government [Member]
   
Available-for-sale securities: 28,386 99,622
Fair Value Measurements Recurring [Member] | Collateralized Mortgage Backed Securities [Member]
   
Available-for-sale securities: 73,466 92,580
Fair Value Measurements Recurring [Member] | Us States and Political Subdivisions Debt Securities [Member]
   
Available-for-sale securities: 118,177 100,526
Fair Value Measurements Recurring [Member] | Corporate Debt Securities [Member]
   
Available-for-sale securities: 13,848 1,081
Fair Value Measurements Recurring [Member] | Interest Rate Swap [Member]
   
Derivative assets 389 617
Derivative liabilities 389 617
Fair Value Measurements Recurring [Member] | Interest Rate Cap [Member]
   
Derivative assets   9
Fair Value Measurements Recurring [Member] | Fair Value Inputs Level 2 [Member]
   
Total assets   294,435
Fair Value Measurements Recurring [Member] | Fair Value Inputs Level 2 [Member] | Us Treasury and Government [Member]
   
Available-for-sale securities: 28,386 99,622
Fair Value Measurements Recurring [Member] | Fair Value Inputs Level 2 [Member] | Collateralized Mortgage Backed Securities [Member]
   
Available-for-sale securities: 73,466 92,580
Fair Value Measurements Recurring [Member] | Fair Value Inputs Level 2 [Member] | Us States and Political Subdivisions Debt Securities [Member]
   
Available-for-sale securities: 118,177 100,526
Fair Value Measurements Recurring [Member] | Fair Value Inputs Level 2 [Member] | Corporate Debt Securities [Member]
   
Available-for-sale securities: 13,848 1,081
Fair Value Measurements Recurring [Member] | Fair Value Inputs Level 2 [Member] | Interest Rate Swap [Member]
   
Derivative assets 389 617
Derivative liabilities 389 617
Fair Value Measurements Recurring [Member] | Fair Value Inputs Level 2 [Member] | Interest Rate Cap [Member]
   
Derivative assets   $ 9